$OpenBSD: patch-lib_isnan_c,v 1.2 2013/11/22 19:53:46 brad Exp $
--- lib/isnan.c.orig	Sun Sep 22 02:15:20 2013
+++ lib/isnan.c	Thu Nov 21 01:48:42 2013
@@ -119,7 +119,8 @@ FUNC (DOUBLE x)
      because x may be a signaling NaN.  */
 #  if defined __SUNPRO_C || defined __ICC || defined _MSC_VER \
       || defined __DECC || defined __TINYC__ \
-      || (defined __sgi && !defined __GNUC__)
+      || (defined __sgi && !defined __GNUC__) \
+      || (defined __vax__ && defined __OpenBSD__)
   /* The Sun C 5.0, Intel ICC 10.0, Microsoft Visual C/C++ 9.0, Compaq (ex-DEC)
      6.4, and TinyCC compilers don't recognize the initializers as constant
      expressions.  The Compaq compiler also fails when constant-folding
